John George Williams's A field guide to the butterflies of africa PDF

By John George Williams

ISBN-10: 0002190273

ISBN-13: 9780002190275

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It becomes a problem to discover phenomena dependent on such velocities. Can any phenomena be detected which are unequivocally due to a quasi-absolute motion of the earth through the ether ? g. the earth and a planet, or a star. For such phenomena are evidently primarily due to the relative velocity of the two bodies to each other, and the velocities relatively to the ether only arise as a hypothetical intermediate explanatory analysis. We require phenomena concerned solely with the earth, WhICh are modified by the earth's motion through the ether without reference to any other matter.

DITIONS OF SCIE~CE 8'7 The physical consequences of this r$=sult are best seen by taking a particular case. The earth is rotating and its parts are held together by their mutual gravitational attractions. The result is that the figure bulges at the equator; and, after allowing for the deficiencies of our observational knowledge, the results of theory and experiment are in fair agreement. The dynamical theory of this investigation does not depend on the existence of any material body other than the earth.

UZa. ~·Xa. '. '. ) be the electric force at (xa.. Ya. , N a) be the magnetic force at the same point and time . ) Its velocity; and let (Pi. , ta). Finally let c be the velocity of light in vacuo. Then Lorentz's form of Maxwell's equations is diva. •.... (I) diva. ) = 0, .. . ) = ~ {o~a. )} , (3) I (] curIa. (Fa, Ga.. ) = - Ccta. (La.. ), ...... ' .. , Ra) = (Fa, Ga.. ). (La.. Ma.. )]. (5) It will be noted that each of the vector equations (3). (4). (5) stands for three ordinary equations, so that there are eleven equations in the five formulae.

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A field guide to the butterflies of africa by John George Williams


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